Case file · Sighting
Agoncillo silent triangle
On 20 July 1978 a soldier, an ensign and a corporal at the Agoncillo base (La Rioja) watched a small, slow, silent object with white lights at its corners at about 1,000 m.
1978 CE · 42.45, -2.29 · status: unexplained
The researched reading
Three soldiers saw a quiet, slow light formation at night. An aircraft or balloon is the most likely explanation.
| Explanation | Weight | Why |
|---|---|---|
| Something known, misidentified | 40% | A slow, silent object with white lights at its corners at 01:20 near Logroño–Agoncillo airport fits an aircraft at higher altitude than estimated, or a balloon; witnesses usually connect separate lights into a triangle. |
| Undetermined | 18% | The share a generic explanation had beyond what has been shown for this case: it fits many cases like this one, but has not been demonstrated for this one. |
| Genuinely anomalous | 14% | Three military witnesses, but nothing in the description goes beyond an aircraft or balloon. |
| Secret human technology | 12% | Military aircraft at night are often unlit or unusually lit. |
| Perception, memory or mind | 10% | Altitude and silence are hard to judge at night; a guard alerted others, who saw what he described. |
| A known natural phenomenon | 3% | No atmospheric effect is suggested. |
| A poorly understood natural phenomenon | 2% | Nothing points to an unusual natural light. |
| A hoax or fabrication | 1% | An official military report. |
Official position: The Spanish military file records the sighting; no explanation was given.